include the pep517 prerelease

jaraco · jaraco · commit c7b3660490e3 · 2019-05-19T15:42:07.000-04:00
diff --git a/tox.ini b/tox.ini
@@ -32,6 +32,7 @@ deps =
      py27: contextlib2
      pip >= 18
      packaging
+     git+https://github.com/pypa/pep517@feature/build-meta-command
 setenv =
     cov: COVERAGE_PROCESS_START={[coverage]rcfile}
     cov: COVERAGE_OPTIONS="-p"
